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Old 11-17-2017, 02:03 AM   #1
Low_Hardbody
 
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Default won't start without using the accelerator

The short story: My 94 D21 2.4L won't start at all unless I "pump" the gas pedal once, then it idles poorly, as if its missing on a cylinder. This started today after I got off the highway.

The WHOLE story:
94 XE standard cab, bought it 2 years ago with 72K on it.
77K on it now.
I'm the 2nd owner
clean as heck!
bought from an older couple, they purchased it new in AZ.

started performing a "tune up" last week. Im pretty sure its never been done.
New plugs
New cap/rotor
New fuel filter, fuel that came out of it was black!
Flushed the brake system
Repacked the wheel bearings
New radius arm bushings
New sway bar bushings

Still needs an air cleaner...its not really that dirty
Still needs plug wires...they're not really bad, its just time.

After what I did the truck ran 120% better! More power, more responsive! Drove it for a week with no issues.
Got off the highway today, after 72 miles at 80mph(ish), Stopped to check traffic, it died, I got it started after several panic attempts. Drove it home without issue.

When I attempt to start the truck, I have to pump the gas pedal like a carburated car, starts right up...idles like ass. Like it missing on a cylinder or has a vacuum leak. Chugs. Acceleration is chuggy, if I hold it at a rep(1500-2K), it sounds like a miss maybe.

Thoughts & suggestions please? I'm wondering if has a simple vacuum leak of maybe a Idle/air valve gone bad? I'm not that familiar with this engine.

I took the air cleaner assembly off & check around a little, didn't find much more than a vacuum line that MAY have a crack in it. Otherwise they all could use replacing due to age.
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Old 11-17-2017, 03:09 AM   #2
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Default

A loose ignition cable perhaps? What happens if you spray them with water while the engine is running?

Is your check engine light on/was it on before?
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Old 11-17-2017, 03:28 AM   #3
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Quote:
Originally Posted by highest_vision View Post
A loose ignition cable perhaps? What happens if you spray them with water while the engine is running?

Is your check engine light on/was it on before?
No CEL.
I may try spring some carb cleaner around some vacuum lines tomorrow. Ignition seems okay, I suspect fuel delivery or idle circuit or maybe a lose vacuum line
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Old 11-17-2017, 03:10 PM   #4
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Injector goen bad? Pull each connector one at a time to see if it gets worse or stays the same. Do the same with the plug wires.
If you pull one and it doesn't get worse, you found your non-running cylinder.
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Old 11-17-2017, 04:48 PM   #5
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could also be a throttle position sensor being out of position causing it to think its "less than closed" when its at idle position. or an idle set screw/stop misaligned.
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Old 11-17-2017, 05:03 PM   #6
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Quote:
Originally Posted by Reserector View Post
Injector goen bad? Pull each connector one at a time to see if it gets worse or stays the same. Do the same with the plug wires.
If you pull one and it doesn't get worse, you found your non-running cylinder.
Thanks, Iíll check this afternoon.
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Old 11-17-2017, 10:59 PM   #7
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Quote:
Originally Posted by highest_vision View Post
A loose ignition cable perhaps? What happens if you spray them with water while the engine is running?

Is your check engine light on/was it on before?
Nope. Sprayed all kinds of stuff this evening. Lol
No change.
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Old 11-17-2017, 11:00 PM   #8
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Quote:
Originally Posted by Reserector View Post
Injector goen bad? Pull each connector one at a time to see if it gets worse or stays the same. Do the same with the plug wires.
If you pull one and it doesn't get worse, you found your non-running cylinder.
The injectors tested good. Thanks
Plug wire test was okay as well
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Old 11-17-2017, 11:00 PM   #9
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Quote:
Originally Posted by street_rulerr View Post
could also be a throttle position sensor being out of position causing it to think its "less than closed" when its at idle position. or an idle set screw/stop misaligned.
Iíll have to take a look. Thanks
It wonít even start if I donít pump the gas pedal
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Old 11-18-2017, 12:10 AM   #10
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if you unplug the TPS or even that MAF and theres no change thats a good quick way to diagnose that it is or isnt that specific piece.
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